Abstract
This letter introduces a frequency-reconfigurable dielectric resonator antenna (DRA) with a water layer integration. The proposed method is based on the strategy-combination of mode reconfiguration and dielectric loading. Firstly, the frequency band of the DRA is reconfigured between the resonant frequencies of the fundamental <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$TE^\rm{y}_{111}$</tex-math></inline-formula> and quasi- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$TE^\rm{y}_{111}$</tex-math></inline-formula> modes by flowing liquid control of water pumping in and out of the microfluidic cavity. Then, the frequency response of quasi- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$TE^\rm{y}_{111}$</tex-math></inline-formula> mode is continuously swept by altering the thickness of water layer. For demonstration, the DRA is designed with a solid dielectric material of K9 glass with the permittivity of 6.25 and loaded with a layer of fresh water with the permittivity of 77. Finally, the proposed antenna is fabricated and measured, which performs with a wideband reconfigurability and stable far-field performance corresponding to the different frequency responses.
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